perf intel-pt: Synthesize iflag event

Synthesize an attribute event and sample events for changes to the
interrupt flag represented by the MODE.Exec packet.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20220124084201.2699795-16-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 1e07a3c..c5b860c 100644 (file)
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -124,6 +124,9 @@ struct intel_pt {
        u64 evt_sample_type;
        u64 evt_id;
 
+       u64 iflag_chg_sample_type;
+       u64 iflag_chg_id;
+
        u64 tsc_bit;
        u64 mtc_bit;
        u64 mtc_freq_bits;
@@ -2209,6 +2212,39 @@ static int intel_pt_synth_events_sample(struct intel_pt_queue *ptq)
                                            pt->evt_sample_type);
 }
 
+static int intel_pt_synth_iflag_chg_sample(struct intel_pt_queue *ptq)
+{
+       struct intel_pt *pt = ptq->pt;
+       union perf_event *event = ptq->event_buf;
+       struct perf_sample sample = { .ip = 0, };
+       struct perf_synth_intel_iflag_chg raw;
+
+       if (intel_pt_skip_event(pt))
+               return 0;
+
+       intel_pt_prep_p_sample(pt, ptq, event, &sample);
+
+       sample.id = ptq->pt->iflag_chg_id;
+       sample.stream_id = ptq->pt->iflag_chg_id;
+
+       raw.flags = 0;
+       raw.iflag = ptq->state->to_iflag;
+
+       if (ptq->state->type & INTEL_PT_BRANCH) {
+               raw.via_branch = 1;
+               raw.branch_ip = ptq->state->to_ip;
+       } else {
+               sample.addr = 0;
+       }
+       sample.flags = ptq->flags;
+
+       sample.raw_size = perf_synth__raw_size(raw);
+       sample.raw_data = perf_synth__raw_data(&raw);
+
+       return intel_pt_deliver_synth_event(pt, event, &sample,
+                                           pt->iflag_chg_sample_type);
+}
+
 static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,
                                pid_t pid, pid_t tid, u64 ip, u64 timestamp)
 {
@@ -2321,6 +2357,11 @@ static int intel_pt_sample(struct intel_pt_queue *ptq)
                        if (err)
                                return err;
                }
+               if (state->type & INTEL_PT_IFLAG_CHG) {
+                       err = intel_pt_synth_iflag_chg_sample(ptq);
+                       if (err)
+                               return err;
+               }
        }
 
        if (pt->sample_pwr_events) {
@@ -3531,6 +3572,17 @@ static int intel_pt_synth_events(struct intel_pt *pt,
                id += 1;
        }
 
+       if (pt->synth_opts.intr_events && pt->cap_event_trace) {
+               attr.config = PERF_SYNTH_INTEL_IFLAG_CHG;
+               err = intel_pt_synth_event(session, "iflag", &attr, id);
+               if (err)
+                       return err;
+               pt->iflag_chg_sample_type = attr.sample_type;
+               pt->iflag_chg_id = id;
+               intel_pt_set_event_name(evlist, id, "iflag");
+               id += 1;
+       }
+
        return 0;
 }